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Metalworking (rec.crafts.metalworking) Discuss various aspects of working with metal, such as machining, welding, metal joining, screwing, casting, hardening/tempering, blacksmithing/forging, spinning and hammer work, sheet metal work. |
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OT - Metal Content. Bullet Actual sizes?
Greetings
I have a couple questions on bullet sizes and barrel thickness. In order to keep my hand in over summer break, I'm in the midst of a CAD project. Maybe I can learn a few things too, about CAD, Catia and the object of my project. Yes, for "grins and giggles", I am attempting to gin up drawings for the 6.35 mm "Pistola Con Caricato". The three barrel 18 shot one off from the 1920's. Yeah, that one. So, I have the SAAMI pdf with the dimension of the standard .25 cal / 6.35x16mmSR Browning cartridge. "Way cool" - but it did cause a bit of "redrawing" as I had made preliminary drawings with a dimension of 6.35 mm. "oops" (Actually, I was trying to get the geometry sorted out, how to get lines to start where I wanted them, instead of the apparent random location the program defaults to.) Anyway, I now have a nice profile of a standard 6.36x16mmSR round - bullet and cartridge. [23.11 mm OAL, as per spec]. What I don't know however is: how long is the bullet itself? "As Drawn" the bullet has nothing inside the brass to hold it together. While this may not be a serious problem for merely drafting a chamber for the cartridge, it offends my Professional Standards to not have a "real bullet" correctly sized which can then be matched up with the cartridge, and then that Assembly inserted into the Cylinder Unit. So, my questions: 1) Does anyone have the specs for the bullets themselves? Or a link to where those same specs can be found? 2) Barrel dimensions. I have learned so far that the 25ACP is a "low power" round, so barrel thickness is not a serious matter. I'm guesstimating from the half dozen available photos somewhere around 2 to 3 mm thickness, which gives a diameter of 10.35 to 11.35 mm, if based off the bullet diameter, 11 to 13 mm if base off the cartridge diameter. [FWI, I have set this up with the semi-deranged idea that I can change a few constants and viola - scale it up to .38, 38 Special, 357, 40 S&W or 45 ACP. Or down to a .22 short. Or whatever. [.600 Nitro Express? .50 BMG?] So, I need a formula of some sort, or a reference chart, that will provide me with some kind of ball park figure for the actual barrel thickness ( radius of the out side of the barrel minus the bore radius). As in "If you were going to bore a hole the length of a steel round to serve as a barrel, what radius/diameter round would you need?" (As I sit here, I realize I can start by boring a hole in a 6 inch cube, then turn the cube down concentric to the axis, until I get a barrel radius of the size I want. But that size is also determined by the strength of the material, the pressure in the chamber, intended amount felt recoil, and so forth. But I don't know what outside diameter should be. (Yeah, I know - "About that much, plus or minus a quart...") So, does anyone have ballpark figures for determining barrel dimensions, based upon the size bullet / cartridge it is to fire? Part of me thinks even an "X is safe, plus a safety margin of Y%" would work. At least for a "proof of concept" silliness. I think I am going to have to take that class on materials properties. tschus pyotr -- pyotr filipivich. Discussing the decline in the US's tech edge, James Niccol once wrote "It used to be that the USA was pretty good at producing stuff teenaged boys could lose a finger or two playing with." |
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